Weight management
Foods low in Calories
Total food energy. 1 kcal = 4.184 kJ, what gets burned in metabolism or stored.
Looking for what Calories is and where it comes from? See the Calories overview.
Why eat low calories?
For weight management, the most useful low-calorie foods are high in volume relative to calories, meaning they fill you up without contributing much to your daily intake. Calorie density (calories per gram) is the relevant metric: foods under about 1.5 kcal/g are good "volume foods", while foods over 4 kcal/g are concentrated and easy to overeat.
Low-calorie-density foods are high in water, fibre, or both. Examples include leafy greens (spinach, lettuce, kale at ~20 kcal/100 g), watermelon (~30 kcal/100 g), cucumber and courgette (~15 kcal/100 g), broth-based soups, and most non-starchy vegetables. These foods naturally cap how many calories you can comfortably consume.
A low-calorie diet that succeeds long-term emphasises satiety: pairing high-volume foods with adequate protein (eggs, chicken breast, white fish, tofu, beans). Low-calorie does not mean nutrient-poor, many of the lowest-calorie foods are also among the most nutrient-dense per calorie. Avoid "diet" packaged products that simply remove fat or sugar without adding fibre or protein.
Foods lowest in calories
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Common questions
- What is calorie density and why does it matter?
- Calorie density is calories per gram of food. Foods low in calorie density (under about 1.5 kcal/g) tend to be high in water and fibre, leafy greens, watermelon, soup, most vegetables. They're filling for relatively few calories, which makes a calorie-controlled diet easier to sustain because hunger is rarely the limiting factor.
- Why aren't low-calorie foods always filling?
- Satiety depends on volume, fibre, protein, and water content, not just calories. A diet soda has 0 calories but no satiating effect; a 50-calorie apple is filling because of its volume, fibre, and chewing time. Pairing low-calorie foods with adequate protein is usually the best practical approach.
- Can I eat unlimited low-calorie foods?
- In practice, yes, most people can't overeat to a problematic degree on cucumbers, leafy greens, or watermelon. The bigger risk is that "low-calorie" packaged foods (diet snacks, sugar-free sweets) are easier to overconsume than their volume suggests, and can crowd out more nutritious foods.
- Does drinking water help me eat fewer calories?
- Modestly. Some studies show drinking water before meals reduces calorie intake by 70-80 calories per meal in middle-aged and older adults. Effects are smaller in younger adults. Soup and high-water foods can produce a similar effect at meals.